施主掺杂对BaTiO3钙钛矿半导体纳米晶光催化性能的影响  

Effects of Donor-Doped on Photocatalytic Properties of BaTiO3-Based Nanoparticle

作　　者：孟国祥 田晓霞[2] 张家瑞 张翔[1] 韩丰庆 屈绍波[2] MENG Guo-Xiang;TIAN Xiao-Xia;ZHANG Jia-Rui;ZHANG Xiang;HAN Feng-Qing;QU Shao-Bo(Cadet Brigade 1,School of Aeronautics and Astronautics Engineering,Air Force Engineering University,Xi′an 710051,China;Department of Basic Sciences,Air Force Engineering University,Xi′an 710051,China;Cadet Brigade 2,Air and Missile Defense College,Air Force Engineering University,Xi′an 710051,China)

机构地区：[1]空军工程大学航空航天工程学院学员一大队,西安710051 [2]空军工程大学基础部,西安710051 [3]空军工程大学防空反导学院学员二大队,西安710051

出　　处：《无机化学学报》2019年第8期1387-1395,共9页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21471159);国家级大学生创新创业计划(No.201890052006);陕西省自然科学基金(No.2019JZ-40);省部共建耐火材料与冶金国家重点实验室开放课题(No.G201707);空军工程大学基础部自主立项科研(No.YNJC19070601,JK2019115)资助项目

摘　　要：以沉淀法制备的Cu2O为牺牲模板剂,采用水热法制备La施主掺杂的BaTiO3钙钛矿半导体纳米晶,借助X射线衍射(XRD)、透射电子显微镜(TEM)、高分辨透射电镜(HRTEM)、X射线光电子能谱((XPS)、扫描电子显微镜(SEM)、紫外-可见漫反射光谱(UV-Vis DRS)表征La掺杂的BaTiO3晶的物相、微观形貌及光催化性能。结果表明,La掺杂BaTiO3构建了晶体缺陷,有效提高了BaTiO3的光催化性能。当掺杂量为4%(w/w)时,样品的光催化性能最好,在可见光照射360 min后,对4-硝基苯酚溶液的降解率可达到93.2%。该催化剂5次循环后的活性仍然大于86.7%,表明La施主掺杂的BaTiO3是一种有效的可见光催化剂。Cu2O was synthesized by chemical precipitation,La doped BaTiO3-based powders were synthesized via a hydrothermal method using the Cu2O as the sacrifice template.The structure,morphology and visible light properties have been characterized by X-ray diffraction (XRD),transmission electron microscope (TEM),high-resolution transmission electron microscope (HR-TEM),X-ray photoelectron spectroscopy (XPS),scanning electron micro-graphs (SEM),UV-Vis diffuse reflectance spectrophotometer (UV-Vis DRS).The results showed that the doping of La^3+ increased the conductivity and made the range of photo-response broadened,which reduced the band gap of the semiconductor and accelerated the separation of photo-generated electron hole pairs.The surface defects were induced with a facile and effective approach by La^3+ ion doping,and the photocatalytic performance of BaTiO3 was improved.However,as the doping amount of La^3+ ions increased,the band gap of the semiconductors decreased and the redox ability of the phototgenerated electrons and holes deceased when the dopant was excessive.When the doping amount was 4%(w/w),the photocatalytic performance of the sample was the best,and the degradation efficiency of 4-nitrophenol was 93.2% after 360 min visible light irradiation.The decomposition rate of 4-nitrophenol was still above 86.7% even after 5 cycles,thus artificial catalytic defects of La donor-doped BaTiO3-based nanoparticle could effectively improve the photocatalytic properties.

关 键 词：BATIO3 施主掺杂 模板法 光催化 

分 类 号：O643.3[理学—物理化学]